| 3401 | Landers Production Company | Granite, OK 73547-0093 | Oil Operator | Apr 2014 |
| 3402 | Landmark Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | Oct 2025 |
| 3403 | Landmark Exploration Co | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2013 |
| 3404 | Landmark Operating Company | Welty, OK 74833-3923 | Oil Operator | Aug 2015 |
| 3405 | Landmark Production Company | MC Gregor, TX 76657 | Oil & Gas Operator | Oct 2010 |
| 3406 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 3407 | Langley Harold | Graham, OK 73437 | Oil Operator | Oct 2025 |
| 3408 | Lansden Operating Co LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 1997 |
| 3409 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 3410 | Lar-Mie Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1998 |
| 3411 | Laran Operating LLC | Dover, OK 73734-0057 | Oil & Gas Operator | Mar 2015 |
| 3412 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 3413 | Lariat Energy & Supply Co Inc | Hulbert, OK 74441 | Oil & Gas Operator | Jun 2025 |
| 3414 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 3415 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Dec 2025 |
| 3416 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 3417 | Larkin Oil Co | Sasakwa, OK 74867 | Oil & Gas Operator | Aug 2015 |
| 3418 | Larkspur Operating LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2025 |
| 3419 | Larmore Jr James E | Bartlesville, OK 74006-8312 | Oil Operator | Mar 2017 |
| 3420 | Larron Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2015 |
| 3421 | Larry Brown Dba Brown Oil Company | Ardmore, OK 73401 | Oil Operator | Apr 2015 |
| 3422 | Larry Sherman Oil LLC | Chandler, OK 74834 | Oil & Gas Operator | Nov 2025 |
| 3423 | Larry Wolff Dba Wolff'S Oilfield Service | Cushing, OK 74023-9789 | Oil & Gas Operator | Oct 2025 |
| 3424 | Larson Exploration Company | Tulsa, OK 74136-4939 | Oil & Gas Operator | Jul 2016 |
| 3425 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 3426 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 3427 | Lashley Oil Company Inc | Walters, OK 73572 | Oil Operator | Dec 2014 |
| 3428 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 3429 | Last Run LLC | Rillito, AZ 85246 | Oil & Gas Operator | May 2020 |
| 3430 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 3431 | Latham Roger P C | Dallas, TX 75244 | Oil Operator | Apr 2015 |
| 3432 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 3433 | Latigo Oil & Gas, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Nov 2025 |
| 3434 | Latigo Petroleum LLC | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 3435 | Latigo Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 3436 | Lauck & Associates | Walnut Creek, CA 91789 | Oil & Gas Operator | Nov 2025 |
| 3437 | Laughlin Jack D | Cushing, OK 74023 | Oil & Gas Operator | Sep 2016 |
| 3438 | Laurco Energies,Inc | | Oil & Gas Operator | May 2025 |
| 3439 | Laurel Operating Company | Stillwater, OK 74074-3025 | Oil & Gas Operator | Oct 2025 |
| 3440 | Laverty, Thomas R | | Oil & Gas Operator | Dec 2023 |
| 3441 | Law E Edward | Newkirk, OK 74647-2056 | Oil Operator | Sep 2025 |
| 3442 | Lawco Exploration Inc | Bentonville, AR 72712 | Oil & Gas Operator | Aug 2024 |
| 3443 | Lawco Holdings LLC | Bentonville, AR 72712 | Oil Operator | Oct 2025 |
| 3444 | Lawrence Hot Oil Service | Loco, OK 73442 | Oil & Gas Operator | Oct 2025 |
| 3445 | Lawrence James Oil Prop Inc | Catoosa, OK 74015 | Oil & Gas Operator | Feb 2012 |
| 3446 | Lawrence Roy Drilling Co Inc | Pawnee, OK 74058-0306 | Oil & Gas Operator | Aug 2000 |
| 3447 | Lawrence, C. F. & Assoc. Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2025 |
| 3448 | Lawson George E | Sand Springs, OK 74063 | Oil & Gas Operator | May 2013 |
| 3449 | Layco Oil | Okmulgee, OK 74447-2065 | Oil & Gas Operator | Apr 2020 |
| 3450 | Layton Oil Co | | Oil Operator | Feb 1994 |
| 3451 | Lazy H Investment | Chandler, OK 74834 | Oil & Gas Operator | Nov 1993 |
| 3452 | LBJ Production Inc | Okmulgee, OK 74447 | Oil Operator | Nov 1998 |
| 3453 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Nov 2025 |
| 3454 | Ldo LLC | Skiatook, OK 74070 | Oil Operator | Sep 2025 |
| 3455 | Le Bas Operating Company, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2000 |
| 3456 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 3457 | Le Norman Partners LLC | Duncan, OK 73533-9523 | Oil & Gas Operator | Feb 2012 |
| 3458 | Leake Keith D | Winfield, KS 67156-8871 | Oil Operator | Apr 2004 |
| 3459 | Leaman Oil Company | Roland, OK 74954 | Oil & Gas Operator | Apr 2014 |
| 3460 | Lear Petroleum Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2015 |
| 3461 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 3462 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 3463 | Leatherneck Energy Group Inc | Addison, TX 75001-6025 | Oil & Gas Operator | Apr 2020 |
| 3464 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 3465 | Ledford Jan Oil & Gas | Duncan, OK 73533-3210 | Oil Operator | Nov 2025 |
| 3466 | Lee Energy Exploration LTD | Oklahoma City, OK 73102-7114 | Oil & Gas Operator | Jul 2008 |
| 3467 | Lee Energy LLC | Edmond, OK 73034-7668 | Oil Operator | Jan 2005 |
| 3468 | Lee Jr W E | Beggs, OK 74421-2683 | Oil & Gas Operator | May 2013 |
| 3469 | Lee Of Tulsa Oil & Gas Inc | Tulsa, OK 74114-5634 | Oil & Gas Operator | Dec 2021 |
| 3470 | Lee Ron | Emory, TX 75440 | Oil Operator | Jul 2025 |
| 3471 | Leed Energy LLC | Purcell, OK 73080-1383 | Oil & Gas Operator | Oct 2025 |
| 3472 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 3473 | Leeman Don J | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1998 |
| 3474 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 3475 | Lefco Resources LLC | Henryetta, OK 74437 | Gas Operator | Oct 2025 |
| 3476 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Oct 2025 |
| 3477 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 3478 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Nov 2025 |
| 3479 | Legacy Oklahoma Operators LLC | Shawnee, OK 74804-1447 | Oil & Gas Operator | Oct 2025 |
| 3480 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 3481 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 3482 | Legado Midcon LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 3483 | Legend Energy Corporation | Stillwater, OK 74074-1721 | Oil & Gas Operator | Aug 2022 |
| 3484 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 3485 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Nov 2025 |
| 3486 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Aug 2025 |
| 3487 | Lenhart Oil Company | Cashion, OK 73016-0188 | Oil & Gas Operator | Jul 2016 |
| 3488 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 3489 | Leonard Vann | | Oil Operator | Oct 2025 |
| 3490 | Leopold Oil Company | Bartlesville, OK 74003 | Oil & Gas Operator | Oct 2025 |
| 3491 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 3492 | Lester Joan | Sand Springs, OK 74063 | Oil & Gas Operator | Oct 2025 |
| 3493 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 3494 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 3495 | Lewbet Inc | Perry, OK 73077 | Oil & Gas Operator | Aug 2024 |
| 3496 | Lewis A. Hembree Production Company | Shawnee, OK 74801 | Oil & Gas Operator | Oct 2025 |
| 3497 | Lewis Energy LLC | Tulsa, OK 74159 | Oil Operator | Oct 2025 |
| 3498 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 3499 | Lewis James D Oil Company | Healdton, OK 73438 | Oil Operator | Aug 2025 |
| 3500 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |